Update the specs with more clarity about JS string encoding for the FORM

Build: 6.5.1-6299

If we pass form param as JS string (Eg. "email: a@b.c") , it will not work as it is treated as a single string. To pass it as named parameter, it must be sent as a JS object.

Works:

 var request = {

    path : 'form1',

    encoding: "FORM",

    body: {"email": "joe.blogs@gmail.com"},

 };

Won't work:

    var request = {

	path : 'form1',

	encoding: "FORM",

	body: "email=joe.blogs@gmail.com",

    };

Need to make it clearer in spec doc how to use name=value urlencoded POST parameters and plain string POST.